When a candidate applies for a role. They can attach their LinkedIn profile by clicking on a button to authorise the job board to pull their profile contents into the application form (auto fill) or attach the candidates resume as PDF etc.

This kind of feature will become standard across all job boards over the coming years. You can view my implementation and also another example by Jobping below.

Once the user has authorised the website application, the users LinkedIn resume will attach to the application form.